11,098 research outputs found
The credit restraint program in perspective
Excerpts from a speech to the Assembly for Bank Directors, Southhampton Princess, Bermuda, May 26, 1980
Shadows of the Planck Scale: The Changing Face of Compactification Geometry
By studying the effects of the shape moduli associated with toroidal
compactifications, we demonstrate that Planck-sized extra dimensions can cast
significant ``shadows'' over low-energy physics. These shadows can greatly
distort our perceptions of the compactification geometry associated with large
extra dimensions, and place a fundamental limit on our ability to probe the
geometry of compactification simply by measuring Kaluza-Klein states. We also
discuss the interpretation of compactification radii and hierarchies in the
context of geometries with non-trivial shape moduli. One of the main results of
this paper is that compactification geometry is effectively renormalized as a
function of energy scale, with ``renormalization group equations'' describing
the ``flow'' of geometric parameters such as compactification radii and shape
angles as functions of energy.Comment: 7 pages, LaTeX, 2 figure
Closed loop fiber optic rotation sensor
An improved optical gyroscope is provided, of the type that passes two light components in opposite directions through an optic fiber coil, and which adds a small variable frequency to one of the light components to cancel the phase shift due to rotation of the coil. The amount of coil rotation from an initial orientation, is accurately determined by combining the two light components, one of which has a slightly increased frequency, to develop beats that each represent a predetermined angle of rotation. The direction of rotation is obtained by combining the two light components on a photodetector, intermittently phase shifting a single light component by 90 deg and comparing the direction of change of photodetector output (+ or -) caused by the 90 deg shift, with the slope (+ or -) of the photodetector output at about the same time, when there is a 90 deg shift
Dilatonic p-Branes and Brane Worlds
We study a general dilatonic p-brane solution in arbitrary dimensions in
relation to the Randall-Sundrum scenario. When the p-brane is fully localized
along its transverse directions, the Kaluza-Klein zero mode of bulk graviton is
not normalizable. When the p-brane is delocalized along its transverse
directions except one, the Kaluza-Klein zero mode of bulk graviton is
normalizable if the warp factor is chosen to increase, in which case there are
singularities at finite distance away from the p-brane. Such delocalized
p-brane can be regarded as a dilatonic domain wall as seen in higher
dimensions. This unusual property of the warp factor allows one to avoid a
problem of dilatonic domain wall with decreasing warp factor that free massive
particles are repelled from the domain wall and hit singularities, since
massive particles with finite energy are trapped around delocalized p-branes
with increasing warp factor by gravitational force and can never reach the
singularities.Comment: 13 pages, LaTe
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